I have the exact same problem except I do not have xfinity. My Pandora app on my Samsung smart tv has suddenly been only playing 1-2 songs then no sound for additional songs, but it looks like the song is still playing, just no sound. I have done all the trouble shooting tips but it is still not working correctly. Pandora app works fine on my iphone, ipad, and other tv that uses roku, so this is not a streaming issue but something wrong on Pandora's end. I have been waiting for two days to get a response back from Pandora.
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